CVE-2026-40528

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.8 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 96% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

OpenSC before 0.27.0, fixed in commit 0358817, contains a stack and heap buffer overrun vulnerability in the do_key_value() function in src/pkcs15init/profile.c that allows attackers to corrupt memory by supplying a crafted profile configuration file. During pkcs15-init invocation, a key value entry beginning with '=' followed by more than sizeof(keybuf) characters is copied into keybuf via memcpy without a length check, causing both stack and heap buffer overruns.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
4%
KEV
Not listed

Published

May 29, 2026

Last Modified

July 21, 2026

Advisory Details (2)

Auto-updated Jun 10, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

OpenSC < 0.27.0 Buffer Overrun in do_key_value() via profile.c | Advisories | VulnCheck

https://www.vulncheck.com/advisories/opensc-buffer-overrun-in-do-key-value-via-profile-c
github_commit

commit 0358817ec74a (OpenSC/OpenSC)

Fix landed in OpenSC/OpenSC commit 0358817ec74a — awaiting tagged release

https://github.com/OpenSC/OpenSC/commit/0358817ec74aeca654f83e7709c7720b14c5db59

Vendor Advisories for CVE-2026-40528(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 6× in last 7d / 64× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 187 total refreshes for this CVE.

  1. 2026-09-04 05:06 UTCEPSS rescore
  2. 2026-09-02 14:12 UTCEPSS rescore
  3. 2026-09-01 13:53 UTCEPSS rescore
  4. 2026-09-01 04:39 UTCEPSS rescore
  5. 2026-08-30 19:17 UTCEPSS rescore
  6. 2026-08-30 01:22 UTCEPSS rescore
  7. 2026-08-28 21:41 UTCEPSS rescore
  8. 2026-08-27 14:25 UTCEPSS rescore
  9. 2026-08-26 14:46 UTCEPSS rescore
  10. 2026-08-25 13:49 UTCEPSS rescore
  11. 2026-08-25 04:27 UTCEG score recompute
  12. 2026-08-25 04:27 UTCGHSA enrichment
  13. 2026-08-23 14:16 UTCEG score recompute
  14. 2026-08-23 14:16 UTCGHSA enrichment
  15. 2026-08-23 00:19 UTCEPSS rescore
  16. 2026-08-21 23:49 UTCEPSS rescore
  17. 2026-08-21 15:12 UTCGHSA enrichment
  18. 2026-08-20 23:38 UTCEG score recompute
  19. 2026-08-20 23:38 UTCGHSA enrichment
  20. 2026-08-20 22:55 UTCEPSS rescore
  21. 2026-08-20 10:28 UTCEG score recompute
  22. 2026-08-20 10:28 UTCGHSA enrichment
  23. 2026-08-19 17:03 UTCEPSS rescore
  24. 2026-08-18 13:48 UTCEPSS rescore
  25. 2026-08-17 13:47 UTCEPSS rescore
Show 75 more
  1. 2026-08-17 06:54 UTCEG score recompute
  2. 2026-08-17 06:54 UTCGHSA enrichment
  3. 2026-08-16 14:56 UTCEPSS rescore
  4. 2026-08-16 07:38 UTCEG score recompute
  5. 2026-08-16 07:38 UTCGHSA enrichment
  6. 2026-08-16 02:14 UTCEPSS rescore
  7. 2026-08-15 19:20 UTCEG score recompute
  8. 2026-08-15 19:20 UTCGHSA enrichment
  9. 2026-08-15 01:30 UTCEPSS rescore
  10. 2026-08-15 01:12 UTCGHSA enrichment
  11. 2026-08-14 12:54 UTCGHSA enrichment
  12. 2026-08-14 00:36 UTCEG score recompute
  13. 2026-08-14 00:36 UTCGHSA enrichment
  14. 2026-08-13 22:00 UTCEPSS rescore
  15. 2026-08-13 02:15 UTCGHSA enrichment
  16. 2026-08-12 13:57 UTCEG score recompute
  17. 2026-08-12 13:57 UTCGHSA enrichment
  18. 2026-08-12 13:51 UTCEPSS rescore
  19. 2026-08-12 01:39 UTCEG score recompute
  20. 2026-08-12 01:39 UTCGHSA enrichment
  21. 2026-08-11 13:43 UTCEPSS rescore
  22. 2026-08-11 13:21 UTCEG score recompute
  23. 2026-08-11 13:21 UTCGHSA enrichment
  24. 2026-08-11 00:00 UTCEPSS rescore
  25. 2026-08-10 23:58 UTCGHSA enrichment
  26. 2026-08-10 11:29 UTCGHSA enrichment
  27. 2026-08-09 23:11 UTCEG score recompute
  28. 2026-08-09 23:11 UTCGHSA enrichment
  29. 2026-08-09 13:46 UTCEPSS rescore
  30. 2026-08-09 10:53 UTCGHSA enrichment
  31. 2026-08-08 22:34 UTCGHSA enrichment
  32. 2026-08-08 10:14 UTCGHSA enrichment
  33. 2026-08-07 21:56 UTCEG score recompute
  34. 2026-08-07 21:56 UTCGHSA enrichment
  35. 2026-08-07 09:38 UTCGHSA enrichment
  36. 2026-08-06 21:19 UTCEG score recompute
  37. 2026-08-06 21:19 UTCGHSA enrichment
  38. 2026-08-06 13:46 UTCEPSS rescore
  39. 2026-08-06 09:01 UTCGHSA enrichment
  40. 2026-08-05 20:43 UTCEG score recompute
  41. 2026-08-05 20:43 UTCGHSA enrichment
  42. 2026-08-05 19:17 UTCEPSS rescore
  43. 2026-08-04 23:15 UTCEG score recompute
  44. 2026-08-04 23:15 UTCGHSA enrichment
  45. 2026-08-04 15:10 UTCEPSS rescore
  46. 2026-08-04 10:38 UTCEPSS rescore
  47. 2026-08-04 04:17 UTCGHSA enrichment
  48. 2026-08-03 15:58 UTCEG score recompute
  49. 2026-08-03 15:58 UTCGHSA enrichment
  50. 2026-08-03 10:36 UTCEPSS rescore
  51. 2026-08-03 03:00 UTCGHSA enrichment
  52. 2026-08-02 14:42 UTCEG score recompute
  53. 2026-08-02 14:42 UTCGHSA enrichment
  54. 2026-08-02 02:27 UTCEPSS rescore
  55. 2026-08-02 02:23 UTCGHSA enrichment
  56. 2026-08-01 14:04 UTCEG score recompute
  57. 2026-08-01 14:04 UTCGHSA enrichment
  58. 2026-08-01 04:16 UTCEPSS rescore
  59. 2026-07-31 05:54 UTCEG score recompute
  60. 2026-07-31 05:54 UTCGHSA enrichment
  61. 2026-07-30 16:28 UTCEPSS rescore
  62. 2026-07-30 01:30 UTCEPSS rescore
  63. 2026-07-29 12:02 UTCEG score recompute
  64. 2026-07-29 12:02 UTCGHSA enrichment
  65. 2026-07-28 15:36 UTCEPSS rescore
  66. 2026-07-28 04:07 UTCEG score recompute
  67. 2026-07-28 04:07 UTCGHSA enrichment
  68. 2026-07-27 14:13 UTCEPSS rescore
  69. 2026-07-27 09:12 UTCEG score recompute
  70. 2026-07-27 09:12 UTCGHSA enrichment
  71. 2026-07-26 14:54 UTCEPSS rescore
  72. 2026-07-26 14:54 UTCEPSS rescore
  73. 2026-07-25 14:18 UTCEPSS rescore
  74. 2026-07-25 14:18 UTCEPSS rescore
  75. 2026-07-24 14:17 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-40528?
CVE-2026-40528 is a high vulnerability published on May 29, 2026. OpenSC before 0.27.0, fixed in commit 0358817, contains a stack and heap buffer overrun vulnerability in the dokeyvalue() function in src/pkcs15init/profile.c that allows attackers to corrupt memory by supplying a crafted profile configuration file. During pkcs15-init invocation, a key value entry…
When was CVE-2026-40528 disclosed?
CVE-2026-40528 was first published in the National Vulnerability Database on May 29, 2026, with the most recent update on July 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-40528 actively exploited?
CVE-2026-40528 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 95.8% of all scored CVEs.
What is the CVSS score of CVE-2026-40528?
CVE-2026-40528 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-40528?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40528, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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